extend boot partition vista x64

I wanted to extend the c: drive to give the Vista boot partition more space. I read several articles saying that the boot partition could not be extended; however, Vista's Disk Management console does allow it if you firstly delete an adjacent partition and then the Extend menu function enables.
I've run the disk check and rebooted and everything appears fine. Is it ok or was I just lucky?
Any advice is appreciated. By the way, Vista x64 is fantastic!